Students in the Valley's largest school district return to the classroom next week, but before they set foot on campus they need to be properly vaccinated.

For the next three weeks, Fresno Unified is offering a series of immunization clinics for students to be properly vaccinated.

School starts on August 14, and before students return to the classroom they must meet immunization requirements set by the state of California.

By law, records for students entering 7th grade and all new students will be checked. The law went into effect July 1, 2016, and eliminated religious and personal beliefs as reasons for opting out of the state's mandatory immunizations.

It requires all children be vaccinated before attending private schools, public schools, or day care facilities unless doctors determine medical reasons for not doing so.

All students entering seventh grade must show proof of current vaccination against whooping cough. Students entering kindergarten must be up to date on several vaccinations including T-Dap, mumps, and measles.

Monday morning, dozens of families took advantage of the district's free immunization clinic at Tioga Middle School. Parents say that's just one of several benefits along with convenience and availability.

"Because it is hard to get into the doctor sometimes," parent Leslie Martin said. "So we were going to try to go to the doctor but we couldn't get in until after. It is also nice that it is free. It helps us out financially."